I somehow doubt that we'll get the 1960's Guardians travelling back in time from the 3000's in order to form a new Guardians of the Galaxy in present day.

More likely, I think, is that we'll get be introduced to a lore in which the Guardians is a mantle handed down to various teams throughout the ages, with Yondu and his team (probably consisting of Vance Astro, Martinex, Charlie-27, and maybe Talon and Replica) getting defeated at the hands of Thanos and handing the torch to the new team.

Hmm, that was my EXACT thought (hope?) when the news about Rooker came out.